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From: Sebastian Wiesner <lunaryorn@gmail.com>
Newsgroups: gmane.emacs.devel
Subject: compile mode and $EMACS
Date: Sat, 10 Aug 2013 18:47:55 +0200
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Hello,

I just discovered that compile mode adds "EMACS=t" to the process
environment (see "compilation-start").

What is this variable for?  How is it supposed to be interpreted by
the invoked program?  Which programs do actually use it?

Greetings